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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#pragma once
#include "sqlite3_fwd.h"
#include "sqliteblob.h"
#include "sqliteglobal.h"
#include "sqlitevalue.h"
#include <utils/smallstring.h>
#include <memory>
#include <vector>
#include <iosfwd>
namespace Sqlite {
class Sessions;
enum class Operation : char { Invalid, Insert, Update, Delete };
namespace SessionChangeSetInternal {
class SentinelIterator
{};
class ValueViews
{
public:
ValueView newValue;
ValueView oldValue;
};
class SQLITE_EXPORT ConstTupleIterator
{
public:
using difference_type = int;
using value_type = ValueViews;
using pointer = const ValueViews *;
using reference = const ValueViews &;
using iterator_category = std::forward_iterator_tag;
ConstTupleIterator(sqlite3_changeset_iter *sessionIterator,
int index,
Sqlite::Operation operation)
: m_sessionIterator{sessionIterator}
, m_column{index}
, m_operation{operation}
{}
ConstTupleIterator operator++()
{
++m_column;
return *this;
}
friend bool operator==(const ConstTupleIterator &first, const ConstTupleIterator &second)
{
return first.m_column == second.m_column;
}
friend bool operator!=(const ConstTupleIterator &first, const ConstTupleIterator &second)
{
return !(first == second);
}
ValueViews operator*() const;
private:
sqlite3_changeset_iter *m_sessionIterator = {};
int m_column = 0;
Sqlite::Operation m_operation = Sqlite::Operation::Invalid;
};
class SQLITE_EXPORT Tuple
{
public:
using difference_type = int;
using value_type = ValueView;
using reference = ValueView &;
using const_reference = const ValueView &;
using iterator = ConstTupleIterator;
using const_iterator = ConstTupleIterator;
using size_type = int;
Utils::SmallStringView table;
sqlite3_changeset_iter *sessionIterator = {};
int columnCount = 0;
Sqlite::Operation operation = Sqlite::Operation::Invalid;
ValueViews operator[](int column) const;
ConstTupleIterator begin() const { return {sessionIterator, 0, operation}; }
ConstTupleIterator end() const { return {sessionIterator, columnCount, operation}; }
};
enum class State : char { Invalid, Row, Done };
class SQLITE_EXPORT ConstIterator
{
public:
using difference_type = long;
using value_type = Tuple;
using pointer = const Tuple *;
using reference = const Tuple &;
using iterator_category = std::input_iterator_tag;
ConstIterator(sqlite3_changeset_iter *sessionIterator)
: m_sessionIterator(sessionIterator)
{}
ConstIterator(const ConstIterator &) = delete;
void operator=(const ConstIterator &) = delete;
ConstIterator(ConstIterator &&other)
: m_sessionIterator(other.m_sessionIterator)
, m_state(other.m_state)
{
other.m_sessionIterator = {};
other.m_state = State::Done;
}
ConstIterator &operator=(ConstIterator &&other)
{
auto tmp = std::move(other);
swap(tmp, *this);
return *this;
}
~ConstIterator();
friend void swap(ConstIterator &first, ConstIterator &second) noexcept
{
std::swap(first.m_sessionIterator, second.m_sessionIterator);
std::swap(first.m_state, second.m_state);
}
ConstIterator &operator++();
friend bool operator==(const ConstIterator &first, const ConstIterator &second)
{
return first.m_sessionIterator == second.m_sessionIterator;
}
friend bool operator!=(const ConstIterator &first, const ConstIterator &second)
{
return !(first == second);
}
friend bool operator==(const ConstIterator &first, SentinelIterator)
{
return first.m_state == State::Done;
}
friend bool operator!=(const ConstIterator &first, SentinelIterator)
{
return first.m_state == State::Row;
}
friend bool operator==(SentinelIterator first, const ConstIterator &second)
{
return second == first;
}
friend bool operator!=(SentinelIterator first, const ConstIterator &second)
{
return second != first;
}
Tuple operator*() const;
State state() const { return m_state; }
private:
sqlite3_changeset_iter *m_sessionIterator = {};
State m_state = State::Invalid;
};
} // namespace SessionChangeSetInternal
class SQLITE_EXPORT SessionChangeSet
{
public:
SessionChangeSet(BlobView blob);
SessionChangeSet(Sessions &session);
~SessionChangeSet();
SessionChangeSet(const SessionChangeSet &) = delete;
void operator=(const SessionChangeSet &) = delete;
SessionChangeSet(SessionChangeSet &&other) noexcept
{
SessionChangeSet temp;
swap(temp, other);
swap(temp, *this);
}
void operator=(SessionChangeSet &);
BlobView asBlobView() const;
friend void swap(SessionChangeSet &first, SessionChangeSet &second) noexcept
{
SessionChangeSet temp;
std::swap(temp.m_data, first.m_data);
std::swap(temp.m_size, first.m_size);
std::swap(first.m_data, second.m_data);
std::swap(first.m_size, second.m_size);
std::swap(temp.m_data, second.m_data);
std::swap(temp.m_size, second.m_size);
}
SessionChangeSetInternal::ConstIterator begin() const;
SessionChangeSetInternal::SentinelIterator end() const { return {}; }
void *data() const { return m_data; }
int size() const { return m_size; }
private:
SessionChangeSet() = default;
private:
void *m_data = nullptr;
int m_size = {};
};
using SessionChangeSets = std::vector<SessionChangeSet>;
} // namespace Sqlite
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